Lymphatic Tissue and Organs Flashcards
(41 cards)
Primary lympathic tissue
site of development of maturation of lymphocytes into immuncompetent cells
Two kinds of primary lymphatic tissues
bone marrow
thymus
3 kinds of secondary lymphatic tissue
lymph nodes
MALT
Spleen
Function of secondary lymphatic tissues
confrontation with antigens of pathogens occurs here
Lymph Nodes
filter lymph
MALT
surveillance
Spleen
filters blood
largest lymphatic organ
site of B and T lymphocyte proliferation
perpetual graveyard for cells
GALT
gut associated lymphatic tissue
in lamina propria of GI tract
BALT
bronchus associated lymphathic tissue
located in lamina propria of respiratory tract
GU tract
found in lamina propria of gentiourinary tract
Lamina Propria
latin for first layer
loose CT just inside epithelium
What cell types are seen in diffuse lymphatic tissue
lymphocytes
monocytes
macrophages
plasma cells
Solitary Lymphatic Nodules
are temporary
Aggregates of Lymphatic Nodules
are permanent. ex) peyer’s patches, appendix, BALT
Tonsils
aggregates of Lymphatic Nodules with B-lymphocytes
How can you tell it’s a palatine tonsil
- stratified, squamous, nonkeratinized epithelium
- secondary lymphatic nodules
- crypts
- cap made of dense irregular collagenous CT
Regions of lymph nodes
cortex and medulla
Convex surface of lymph vessel
where lymph vessels bring lymph to the lymph node
Concave surface of lymph vessel
bottom surface
has hilum
Sinuses
pathogens and toxins are filtered out here
Lymph node parechyma
cellular part
Where are B lymphocytes found
nodules/cortex
Where are T lymphocytes found
paracortex
2 sources of lymphocytes
high endothelial venules in paracortex (main source)
afferent lymph vessels
